/*
* Exports and sets up direction for gpio.
* If the gpio is an output, it is initialized according to init_high,
* otherwise it is ignored.
*
* If the gpio is already exported we just show a warning and continue; if
* openocd happened to crash (or was killed by user) then the gpios will not
* have been cleaned up.
*/
static int setup_sysfs_gpio(int gpio, int is_output, int init_high)
{
char buf[40];
char gpiostr[4];
int ret;
if (!is_gpio_valid(gpio))
return ERROR_OK;
snprintf(gpiostr, sizeof(gpiostr), "%d", gpio);
ret = open_write_close("/sys/class/gpio/export", gpiostr);
if (ret < 0) {
if (errno == EBUSY) {
LOG_WARNING("gpio %d is already exported", gpio);
} else {
LOG_ERROR("Couldn't export gpio %d", gpio);
perror("sysfsgpio: ");
return ERROR_FAIL;
}
}
snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/direction", gpio);
ret = open_write_close(buf, is_output ? (init_high ? "high" : "low") : "in");
if (ret < 0) {
LOG_ERROR("Couldn't set direction for gpio %d", gpio);
perror("sysfsgpio: ");
unexport_sysfs_gpio(gpio);
return ERROR_FAIL;
}
snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/value", gpio);
ret = open(buf, O_RDWR | O_NONBLOCK | O_SYNC);
if (ret < 0) {
LOG_ERROR("Couldn't open value for gpio %d", gpio);
perror("sysfsgpio: ");
unexport_sysfs_gpio(gpio);
}
return ret;
}
/*
* Helper func to unexport gpio from sysfs
*/
static void unexport_sysfs_gpio(int gpio)
{
char gpiostr[4];
if (!is_gpio_valid(gpio))
return;
snprintf(gpiostr, sizeof(gpiostr), "%d", gpio);
if (open_write_close("/sys/class/gpio/unexport", gpiostr) < 0)
LOG_ERROR("Couldn't unexport gpio %d", gpio);
return;
}
static void sysfsgpio_swdio_drive(bool is_output)
{
char buf[40];
int ret;
snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/direction", swdio_gpio);
ret = open_write_close(buf, is_output ? "high" : "in");
if (ret < 0) {
LOG_ERROR("Couldn't set direction for gpio %d", swdio_gpio);
perror("sysfsgpio: ");
}
last_stored = false;
swdio_input = !is_output;
}
/*
* Exports and sets up direction for gpio.
* If the gpio is an output, it is initialized according to init_high,
* otherwise it is ignored.
*
* If the gpio is already exported we just show a warning and continue; if
* openocd happened to crash (or was killed by user) then the gpios will not
* have been cleaned up.
*/
static int setup_sysfs_gpio(int gpio, int is_output, int init_high)
{
char buf[40];
char gpiostr[4];
int ret;
int mem_fd;
if(pointer==0){
if ((mem_fd = open("/dev/mem", O_RDWR | O_RSYNC | O_SYNC)) < 0) {
printf("can't open /dev/mem \n");
exit(-1);
}
//printf("vor mmap \n");
mymem = mmap(0,
getpagesize(),
PROT_READ|PROT_WRITE,
MAP_SHARED,
mem_fd,
IOCONFIG);
if (mymem == MAP_FAILED) {
printf("mmap error %d\n", errno);
exit(-1);
}
else {
//printf("mymem = 0x%x\n", (unsigned int)mymem);
}
pointer=1;
}
if (!is_gpio_valid(gpio))
return ERROR_OK;
snprintf(gpiostr, sizeof(gpiostr), "%d", gpio);
ret = open_write_close("/sys/class/gpio/export", gpiostr);
if (ret < 0) {
if (errno == EBUSY) {
LOG_WARNING("gpio %d is already exported", gpio);
} else {
LOG_ERROR("Couldn't export gpio %d", gpio);
perror("sysfsgpio: ");
return ERROR_FAIL;
}
}
snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/direction", gpio);
ret = open_write_close(buf, is_output ? (init_high ? "high" : "low") : "in");
if (ret < 0) {
LOG_ERROR("Couldn't set direction for gpio %d", gpio);
perror("sysfsgpio: ");
unexport_sysfs_gpio(gpio);
return ERROR_FAIL;
}
snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/value", gpio);
if (is_output)
ret = open(buf, O_WRONLY | O_NONBLOCK | O_SYNC);
else
ret = open(buf, O_RDONLY | O_NONBLOCK | O_SYNC);
if (ret < 0)
unexport_sysfs_gpio(gpio);
return ret;
}
